UPD78F9212CS-CAB-A Renesas Electronics America, UPD78F9212CS-CAB-A Datasheet - Page 88

• Manufacturer Part Number: UPD78F9212CS-CAB-A
• Description: MCU 8BIT 4KB FLASH 16PIN
• Manufacturer: Renesas Electronics America
• Series: 78K0S/Kx1+r

Specifications of UPD78F9212CS-CAB-A

• Core Processor: 78K0S
• Core Size: 8-Bit
• Speed: 10MHz
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 13
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Connectivity: -

(3) External clock input circuit
86
Note Operation stop time is 277 s (MIN.), 544 s (TYP.), and 1.075 ms (MAX.).
If external clock input is selected by the option byte, the following is possible.
Figures 5-12 and 5-13 show the timing chart and status transition diagram of default start by external clock input.
(a) The internal reset signal is generated by the power-on-clear function on power application, the option byte is
(b) The option byte is referenced and the system clock is selected. Then the external clock operates as the
High-speed operation
The accuracy of processing is improved as compared with high-speed internal oscillation (8 MHz (TYP.))
because an oscillation frequency of 2 MHz to 10 MHz can be selected and an external clock with a small
frequency deviation can be supplied.
Improvement of expandability
If the external clock input circuit is selected as the oscillator, the X2 pin can be used as an I/O port pin. For
details, refer to CHAPTER 4 PORT FUNCTIONS.
referenced after reset, and the system clock is selected.
system clock.
System clock
Internal reset
CPU clock
RESET
V
DD
H
Figure 5-12. Timing of Default Start by External Clock Input
(a)
System clock is selected.
CHAPTER 5 CLOCK GENERATORS
(Operation stops
Option byte is read.
User’s Manual U16994EJ6V0UD
Note
)
(b)
PCC = 02H, PPCC = 02H
External clock input